I suspect that this is someone who also communicated via support@lairware.com, and they solved it by trashing MPFreaker-related items in the user's Library folder (while MPFreaker is not running, naturally):

Probably only trashing the first one is actually necessary, as their crash log implicated OS X's URL cache. Given the crash logs I have seen from another couple of users, this sounds like a 10.5.7-specific bug in OS X that Apple may have fixed for 10.5.8.